LG KT520 Service Manual page 43

3. TECHNICAL BRIEF
3.1.14 Optical Joystick
The Optical Joystick ¢‚ (OJ) is specially designed to support the graphic user interface (GUI) in
advanced mobile devices (cellular phone, PDA, PMP, DSC etc.). The principles of operation and
optical/mechanical structures are originally similar to the optical mice of PC, however, the design and
principles are modified so that Optical Joystick¢‚ will fit into extremely small space on mobile devices.
• Self-adjusting power-saving modes for longest battery life
• Smart Speed self-adjusting frame rate for optimum performance
• Internal oscillator - no clock input needed
• Wide operating voltage range: 2.6V ~ 3.6V nominal
• Six (6) wired serial port(3~5 wired serial port may be used optionally)
• Keyin4 and Keyout2 are used for "OK" key button.
APP_GP11_OJ_CS_n_2V75
APP_GP04_OJ_MISO_2V75
APP_GP05_OJ_MOSI_2V75
APP_GP06_OJ_SCLK_2V75
ZD104
ESD9X5.0ST5G
INSTPAR
10pin Optical Joystick Connector
LGE Internal Use Only
CN102
G1 G2
1 10
R118
2 9
3 8
4 7
5 6
G3 G4
ZD103
ESD9X5.0ST5G
INSTPAR
AXK7L10227G (0.9T socket)
Figure 3-1-16. Optical Joystick
- 44 -
VDDG_2V75
100K
APP_GP07_OJ_MOTION_n_2V75
KEYIN4
KEYOUT2
ZD100
ESD9X5.0ST5G
INSTPAR
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Only for training and service purposes